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Theorem eldm1cossres2 38860
Description: Elementhood in the domain of restricted cosets. (Contributed by Peter Mazsa, 30-Dec-2018.)
Assertion
Ref Expression
eldm1cossres2 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝑅   𝑥,𝑉

Proof of Theorem eldm1cossres2
StepHypRef Expression
1 eldm1cossres 38859 . 2 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝑥𝑅𝐵))
2 elecALTV 38580 . . . 4 ((𝑥 ∈ V ∧ 𝐵𝑉) → (𝐵 ∈ [𝑥]𝑅𝑥𝑅𝐵))
32el2v1 38538 . . 3 (𝐵𝑉 → (𝐵 ∈ [𝑥]𝑅𝑥𝑅𝐵))
43rexbidv 3159 . 2 (𝐵𝑉 → (∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅 ↔ ∃𝑥𝐴 𝑥𝑅𝐵))
51, 4bitr4d 282 1 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wcel 2114  wrex 3059  Vcvv 3427   class class class wbr 5074  dom cdm 5620  cres 5622  [cec 8630  ccoss 38492
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2707  ax-sep 5220  ax-pr 5364
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2714  df-cleq 2727  df-clel 2810  df-ral 3050  df-rex 3060  df-rab 3388  df-v 3429  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4264  df-if 4457  df-sn 4558  df-pr 4560  df-op 4564  df-br 5075  df-opab 5137  df-xp 5626  df-cnv 5628  df-co 5629  df-dm 5630  df-rn 5631  df-res 5632  df-ima 5633  df-ec 8634  df-coss 38810
This theorem is referenced by:  eldmqs1cossres  39053
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